Water-tube boiler.



C. & C E. WARD. CJE. WARD, ADMlNlSTRATOR OF C. WARD, DEC'D. WATER T UBEBOILER.

' APPLICATION FILED JAN. 12, I915. L15%fi%@ Patented Aug. 31,1915.

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WATER-TUBE BOILER.

intents,

Application filed January 12, 1915.

To all whom it may concern:

Be it known that we, CHARLES WARD and @HAnLns 1E. VTARD, citizens of theUnited States, residing at Charleston, in the county of Kanawha andState of West Virginia, have invented certain new and usefulImprovements in Water-Tube Boilers, of which the following is aspecification.

This invention relates to watertube steam boilers, and has for itsobject the production of a steam generator provided with alternate rowsof larger tubes and banks of smaller tubes arranged as specified anddelineated, whereby it is found in practice that the lower portion ofthe water in the boiler contained in the lower bank of smallertubes andin adjacent rows of larger tubes may be caused to circulate locally whenthe boiler is fired and to attain its full circulatory speed. some timebefore the like circulation is established in the whole body of water,or that contained in the higher bank or banks of smaller tubes. Suchprompt and earlier, although fractional circulation with respect to theentire contents of the boiler, edects a decided economy in fuel and is amaterial. aid to quick steaming, particularly in very large boilers ofthe type to which this invention belongs and in the construction ofwhich it is intended to be applied. Fur- .thermore, the setting up ofthefull circulatory speed in the water of the lowest bank of smallertubes acts to impress a like movement upon the remaining water.

Watertube boilers constructed in accordance with our invention are foundto get up a desired steam pressure in less time and with less fuel thanboilers of similar design but lacking the means for quick local andspecial circulation set forth in this application.

Ihe particular construction and arrangement of parts comprising thisinvention are illustrated in the accompanying drawings, of which Figurel lengthwise of a watertubeboiler constructed in accordance with thisinvention. Fig. 2 is a section of the upper header on the broken linezvm of Fig. l.

In the drawings and throughout the description the same letter isemployed to re-- fer to the same art.

specification of Letters lEatent.

represents a vertical section Patented Aug. 3311, 19115. Serial No.1,247.

(Jonsidering the drawings, in Fig. l the" of the headers as illustratedin Fig. 2.'

Above the tubes C is a layer of baffle plates 0, and next comes a lowerbank of smaller tubes D in any number and extent. Surmounting the bankof smaller tubes D is a row of larger tubes E, similar to the tubes C innumber and position, as this invention is ordinarily constructed. @verthe row of tubes E is a layer of battle plates 6. Intermediate batlleplates F and f are usually placed as shown in the bank of smaller tubesD, to divide the flow of the heated gases and to direct portions thereofamong the tubes D beneath the baffle plates 6 and near the upper headerZ2, and among the tubes D just over the battle plates f and near theheader 18. Over the'baftle plates 0 is located another bank of smallertubes G, similar to the smaller tubes All the tubes mentioned thus farhave both ends connected with the headers. As illustrated, the frontheader B is the lower, and the tubes slant downwardly from a higherpoint at the rear in the upper header 6, to a lower point at the frontof the boiler in the header B. This invention is not limited, however,to the particular direction or inclination of the tubes set forth.

Above the bank of smaller tubes G near the header B is a layer of baffleplates g, and intermediate baffle plates H and it are placed in the bankof tubes G, to divide the current of hot gases and to cause them to seekthe end portions ofthe tubes G beneath the baffle plates 9 and near theheader B, and likewise to spread around the end portions of the tubes Gabove the plates 6 and I b, and the other end connected with the drum jthat is arranged transversely over,

and in communication with the front and lower header B.

In the operation of this invention, the direct heat of the furnace- Aquickly starts an upward flow in the comparatively considerable amountof water in the lower larger tubes C and also in the tubes D of thelower bank of tubes. But, the water in the row of larger tubes E is byno means so suddenly heated tl'iroughout, and a downflow takes place inthose tubes. Thus there is established a local and very soon a completecirculation in speed and volume of the water in the lowest larger tubesC, the lower bank of smaller tubes 1) and thelarger tubes It just abovethe lower bank. The movement is communicated to the remaining water andaids the effect of the heat in starting and bringing up to speed thecirculation thereof.

IIaving now described this invention, and explained the mode of itsoperation, We claim 1. In a watertube steam boiler, the combination witha furnace, of front and rear headers, a drum connected with the upperportions of the headers, banks of tubes of relatively smaller diameterconnecting the headers, the said banks of tubes being arranged one bankabove another, rows of tubes of larger diameter connecting the saidheaders, one of the said rows of larger tubes being arranged next abovethe lowest bank of smaller tubes, and another of the said rows of largertubes being arranged next below the said lowest bank of smaller tubesand directly exposed to the furnace whereby when the boiler is firedcirculation is estab lished in the said lowest bank of smaller tubes andin the said larger tubes next below and above the said bank as describedprior to the circulation in the boiler above the said lowest bank ofsmaller tubes and the said adjacent larger tubes.

2. In a watertube steamboiler, the combination with a furnace, of frontand rear headers, banks of tubes of relatively smaller diameterconnecting the headers, the said banks of tubes being arranged one bankabove another, a drum connected with one of the said headers above theupper bank of smaller tubes, a row of larger tubes connecting the saiddrum with the other header, rows of tubes of larger diameter connectingthe said headers, one of the said rows of larger-tubes being arrangednext above the lowest bank of smaller tubes, and another of the saidrows of larger tubes being arranged next below the said lowest bank ofsmaller tubes and directly exposed to the furnace whereby when theboiler is fired circulation is established in the said lowest bank ofsmaller tubes and in the said larger tubes next below and above the saidbank as described prior to the full circulation in the boiler above thesaid lowest bank of smaller tubes and the said adjacent larger tubes.

In testimony whereof we affix our signatures in presence of twowitnesses.

CHARLES VAR-D. CHARLES E. \VARD. it-nesses E. T. Jonas, CHARLES DRYDEN.

